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Agent skill

Implementing Mimecast Targeted Attack Protection

by mukul975 in mukul975/Anthropic-Cybersecurity-Skills

Deploys and configures Mimecast Targeted Threat Protection (TTP) modules -- URL Protect (click-time URL rewriting/analysis), Attachment Protect (sandbox detonation), Impersonation Protect…

Apache-2.0Auto-check passedDocuments & Office

Install Implementing Mimecast Targeted Attack Protection

skills CLI
$ npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill implementing-mimecast-targeted-attack-protection -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install mukul975/Anthropic-Cybersecurity-Skills implementing-mimecast-targeted-attack-protection --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/mukul975/Anthropic-Cybersecurity-Skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/implementing-mimecast-targeted-attack-protection .claude/skills/implementing-mimecast-targeted-attack-protection && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
implementing-mimecast-targeted-attack-protection
GitHub stars
34k
Token cost
~1.8k tokens
SKILL.md length
704 words
Files
8 (incl. scripts, references, assets)
Skills in repo
644
Repo updated
First seen
Licence
Apache-2.0

At a glance

Deploys and configures Mimecast Targeted Threat Protection (TTP) modules -- URL Protect (click-time URL rewriting/analysis), Attachment Protect (sandbox detonation), Impersonation Protect…

  • Works in 6 steps: Configure URL Protect Policy → Configure Attachment Protect Policy → Configure Impersonation Protect → …
  • Defending against phishing
  • SKILL.md covers Overview, When to Use, Prerequisites and Key Concepts, plus 3 more sections
  • Runs Python scripts from its folder

What it does

Implementing Mimecast Targeted Attack Protection is an agent skill from mukul975/Anthropic-Cybersecurity-Skills. Deploys and configures Mimecast Targeted Threat Protection (TTP) modules -- URL Protect (click-time URL rewriting/analysis), Attachment Protect (sandbox detonation), Impersonation Protect (BEC/whaling detection), and Internal Email Protect -- for Microsoft 365 or Google Workspace. Use when defending against phishing, spearphishing, or business email compromise, or configuring TTP policies in the Mimecast Administration Console.

Its SKILL.md is about 1.8k tokens, which your agent loads only when the skill is triggered. The skill folder holds 10 other files, including scripts, reference files and assets (for example `assets/template.md`, `references/api-reference.md` and `references/standards.md`).

It sits in Documents & Office, covering Cloud office suites. It works with Google Workspace and Microsoft 365. The repository describes itself as: 817 structured cybersecurity skills for AI agents · Mapped to 6 frameworks: MITRE ATT&CK, NIST CSF 2.0, MITRE ATLAS, D3FEND, NIST AI RMF & MITRE F3 (Fight Fraud) · agentskills.io…. The licence is Apache-2.0.

When your agent uses it

  • Defending against phishing
  • Business email compromise
  • Configuring TTP policies in the Mimecast Administration Console

Example prompts

  • “Use the implementing-mimecast-targeted-attack-protection skill to deploy and configures Mimecast Targeted Threat Protection (TTP) modules -- URL…”
  • “/implementing-mimecast-targeted-attack-protection”

Requirements

  • Python 3

Workflow steps

6 steps, taken from the step headings in SKILL.md.

  1. Configure URL Protect Policy
  2. Configure Attachment Protect Policy
  3. Configure Impersonation Protect
  4. Enable Internal Email Protect
  5. Create Test Group and Validate
  6. Deploy Organization-Wide and Tune

What it can do on your machine

Read from SKILL.md and the folder at commit 54a7988. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Ships 2 files in scripts/ (Python), which the agent can run.

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Implementing Mimecast Targeted Attack Protection loads about 1.8k tokens when it runs, and up to ~3.1k if it reads all its reference files. Until then it costs about 120 tokens; SKILL.md has 704 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~120
When it runs · the whole SKILL.md, loaded when a task matches
~1.8k
With references · SKILL.md plus every file in references/, read only if the agent opens them
~3.1k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); the scripts in this folder are not scanned.

SKILL.md

The full file from mukul975/Anthropic-Cybersecurity-Skills at commit 54a7988, republished under its Apache-2.0 licence (© mukul975). 704 words, ~1,778 tokens.

Download SKILL.mdSave it as .claude/skills/implementing-mimecast-targeted-attack-protection/SKILL.md (or your agent's skills folder). This skill also uses 7 other files; get the full folder from GitHub.
name
implementing-mimecast-targeted-attack-protection
description
Deploys and configures Mimecast Targeted Threat Protection (TTP) modules -- URL Protect (click-time URL rewriting/analysis), Attachment Protect (sandbox detonation), Impersonation Protect (BEC/whaling detection), and Internal Email Protect -- for Microsoft 365 or Google Workspace. Use when defending against phishing, spearphishing, or business email compromise, or configuring TTP policies in the Mimecast Administration Console.
domain
cybersecurity
subdomain
phishing-defense
tags
mimecast, email-security, targeted-threat-protection, url-protect, impersonation, attachment-sandboxing, phishing
version
1.0
author
mahipal
license
Apache-2.0
nist_csf
PR.AT-01, DE.CM-09, RS.CO-02, DE.AE-02
mitre_attack
T1566, T1598, T1534, T1036
mitre_f3.version
1.1
mitre_f3.tactics
initial-access, reconnaissance, stealth, resource-development

Implementing Mimecast Targeted Attack Protection

Overview

Mimecast Targeted Threat Protection (TTP) is a suite of advanced email security services designed to protect against sophisticated phishing, spearphishing, and targeted attacks. TTP consists of four core modules: URL Protect (real-time URL rewriting and click-time analysis), Attachment Protect (sandbox detonation of suspicious attachments), Impersonation Protect (BEC and whaling detection), and Internal Email Protect (scanning internal/outbound email for threats). As of November 2025, Mimecast enabled URL Pre-Delivery Action with Hold setting for all customers by default.

When to Use

  • When deploying or configuring implementing mimecast targeted attack protection capabilities in your environment
  • When establishing security controls aligned to compliance requirements
  • When building or improving security architecture for this domain
  • When conducting security assessments that require this implementation

Prerequisites

  • Mimecast Email Security license with TTP add-on
  • Administrative access to Mimecast Administration Console
  • Microsoft 365 or Google Workspace environment
  • MX records configured to route through Mimecast
  • Understanding of email authentication (SPF, DKIM, DMARC)

Key Concepts

TTP Module Overview
ModuleFunctionKey Capability
URL ProtectRewrites and scans URLs at click timeReal-time sandbox, pre-delivery hold
Attachment ProtectSandboxes suspicious attachmentsStatic + dynamic analysis
Impersonation ProtectDetects BEC/whaling attacksVIP name matching, header analysis
Internal Email ProtectScans internal/outbound emailLateral phishing detection
Impersonation Protection Scenarios
  • Hit 3 (Default): Flags emails matching 3+ impersonation indicators
  • Hit 1 (VIP): Flags emails matching 1+ indicator for designated VIP users
  • Key identifiers: display name similarity, domain similarity, reply-to mismatch, newly registered domains
URL Protect Modes
  • Rewrite: URLs rewritten to route through Mimecast proxy at click time
  • Pre-Delivery Action (Hold): URLs checked before message delivery; held if suspicious
  • Pre-Delivery Action (None): URLs checked pre-delivery but not held

Workflow

Step 1: Configure URL Protect Policy
  • Navigate to Administration > Gateway > Policies > Targeted Threat Protection - URL Protect
  • Create URL Protect definition with rewriting enabled for inbound messages
  • Enable URL Pre-Delivery Action set to "Hold" for maximum protection
  • Configure scan mode: aggressive for high-risk users, moderate for general population
  • Set action for malicious URLs: block page with user notification
  • Enable URL logging for all click events
Step 2: Configure Attachment Protect Policy
  • Navigate to Administration > Gateway > Policies > Targeted Threat Protection - Attachment Protect
  • Create Attachment Protect definition for inbound email
  • Select sandbox mode: "Safe File" (converts to safe format) or "Dynamic Configuration" (full sandbox)
  • Configure attachment types to scan: executables, Office documents, PDFs, archives
  • Set timeout for sandbox analysis (default: up to 7 minutes for complex files)
  • Enable pre-emptive sandboxing for attachments from unknown senders
Show full SKILL.md (295 more words)Show less
Step 3: Configure Impersonation Protect
  • Create Default Impersonation Protect Definition (Hit 3) for all inbound email
  • Create VIP Impersonation Protect Definition (Hit 1) for executive protection
  • Build VIP list: CEO, CFO, CTO, board members, finance leadership
  • Configure detection identifiers: display name, domain similarity, newly observed sender
  • Set actions: quarantine high-confidence impersonation, tag moderate confidence
  • Enable end-user warning banners for flagged messages
Step 4: Enable Internal Email Protect
  • Configure journaling from Microsoft 365/Google Workspace to Mimecast
  • Enable URL scanning for internal emails
  • Enable attachment scanning for internal emails
  • Configure alerts for internal account compromise indicators
  • Set up detection for internal phishing (compromised account sending malware)
Step 5: Create Test Group and Validate
  • Create pilot group of 50-100 users across departments
  • Apply TTP policies to pilot group first
  • Send test emails with known-safe test URLs and EICAR test files
  • Verify URL rewriting, attachment sandboxing, and impersonation detection
  • Monitor false positive rate for 1-2 weeks before organization-wide deployment
Step 6: Deploy Organization-Wide and Tune
  • Extend TTP policies to all users
  • Monitor Mimecast Threat Dashboard for detection metrics
  • Review and whitelist legitimate applications triggering false positives
  • Tune impersonation sensitivity based on false positive feedback
  • Configure exception policies for automated systems and mailing lists

Tools & Resources

  • Mimecast Administration Console: Policy configuration and management
  • Mimecast Threat Dashboard: Real-time threat visibility and analytics
  • Mimecast Awareness Training: Integrated security awareness platform
  • Mimecast API: Programmatic access to logs and threat data
  • Message Center: Quarantine management for admins and users

Validation

  • URL Protect rewrites URLs in test messages and blocks known-malicious at click
  • Attachment Protect sandboxes test file and returns verdict within SLA
  • Impersonation Protect flags test BEC email impersonating VIP
  • Internal Email Protect detects test lateral phishing scenario
  • Pre-delivery hold catches weaponized URL before reaching inbox
  • False positive rate below organizational threshold after tuning

© mukul975, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 7 other files (scripts, references, assets) in skills/implementing-mimecast-targeted-attack-protection of mukul975/Anthropic-Cybersecurity-Skills.

  • SKILL.md
  • LICENSE
  • assets/template.md
  • references/api-reference.md
  • references/standards.md
  • references/workflows.md
  • scripts/agent.py
  • scripts/process.py

Open the folder on GitHubat commit 54a7988

Compare with similar skills

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SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Implementing Mimecast Targeted Attack Protection this skillmukul975/Anthropic-Cybersecurity-Skills34k—~1.8kAutomated safety check: PassApache-2.0
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Uipath Activity MigratorUiPath/skills167—~8.5kAutomated safety check: PassMIT
Managing Google Workspacetaylorwilsdon/google_workspace_mcp3.3k—~2.9kAutomated safety check: PassMIT
Gogopenclaw/gogcli8.5k—~2.9kAutomated safety check: PassMIT
Gws Calendar Agendagoogleworkspace/cli31k1 repos~389Automated safety check: PassApache-2.0

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Works with

Categories

Questions about Implementing Mimecast Targeted Attack Protection

What does Implementing Mimecast Targeted Attack Protection do?

Deploys and configures Mimecast Targeted Threat Protection (TTP) modules -- URL Protect (click-time URL rewriting/analysis), Attachment Protect (sandbox detonation), Impersonation Protect…. Implementing Mimecast Targeted Attack Protection is an agent skill from mukul975/Anthropic-Cybersecurity-Skills. Deploys and configures Mimecast Targeted Threat Protection (TTP) modules -- URL Protect (click-time URL rewriting/analysis), Attachment Protect (sandbox detonation), Impersonation Protect (BEC/whaling detection), and Internal Email Protect -- for Microsoft 365 or Google Workspace.

When should I use Implementing Mimecast Targeted Attack Protection?

Implementing Mimecast Targeted Attack Protection fits situations like: defending against phishing; business email compromise; configuring TTP policies in the Mimecast Administration Console.

How do I install Implementing Mimecast Targeted Attack Protection in Claude Code?

Run `npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill implementing-mimecast-targeted-attack-protection -a claude-code`. Or copy the skill folder (skills/implementing-mimecast-targeted-attack-protection in mukul975/Anthropic-Cybersecurity-Skills) into .claude/skills/implementing-mimecast-targeted-attack-protection in your project. Claude Code loads it when a task matches its description.

How do I install Implementing Mimecast Targeted Attack Protection in Codex?

Run `npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill implementing-mimecast-targeted-attack-protection -a codex`. Or copy the skill folder (skills/implementing-mimecast-targeted-attack-protection in mukul975/Anthropic-Cybersecurity-Skills) into .agents/skills/implementing-mimecast-targeted-attack-protection in your project. Codex loads it when a task matches its description.

Can I use Implementing Mimecast Targeted Attack Protection in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill implementing-mimecast-targeted-attack-protection -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/implementing-mimecast-targeted-attack-protection, .gemini/skills/implementing-mimecast-targeted-attack-protection, .github/skills/implementing-mimecast-targeted-attack-protection and .opencode/skills/implementing-mimecast-targeted-attack-protection in your project.

What does Implementing Mimecast Targeted Attack Protection need to run?

Going by SKILL.md and its folder, Implementing Mimecast Targeted Attack Protection needs Python for the scripts in its folder. Our summary lists: Python 3.

Does Implementing Mimecast Targeted Attack Protection access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Implementing Mimecast Targeted Attack Protection safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.

What licence does Implementing Mimecast Targeted Attack Protection use?

Implementing Mimecast Targeted Attack Protection is published under the Apache-2.0 licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Implementing Mimecast Targeted Attack Protection use?

About 1.8k tokens (SKILL.md is roughly 7.1k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 1.3k tokens, read only when the agent opens those files.

What are the alternatives to Implementing Mimecast Targeted Attack Protection?

Skills that share tags, products or a category with Implementing Mimecast Targeted Attack Protection: API Gateway (CraftOS-dev/CraftBot, 392 stars), Uipath Activity Migrator (UiPath/skills, 167 stars), Managing Google Workspace (taylorwilsdon/google_workspace_mcp, 3.3k stars) and Gog (openclaw/gogcli, 8.5k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Implementing Mimecast Targeted Attack Protection?

mukul975 (a GitHub user) maintains it in mukul975/Anthropic-Cybersecurity-Skills, which has 34,116 GitHub stars. The repository holds 644 skills in this directory. The repository was last updated on August 31, 2026.

Source: mukul975/Anthropic-Cybersecurity-Skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.